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Haven't used it myself, but I've seen Rector mentioned a number of times. Beyond that, digging into the 5 to 7 migration guide and the 7 to 8 migration guide would be good to browse.
You may want to look into the PHPCompatibilty ruleset for PHP_CodeSniffer to generate a report of what's obviously broken/deprecated programmatically as well.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.
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